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The p-Block Elements

Multiple Choice Questions

651. The P—P—P bond angle in white phosphorus is

120°
109° 28'
90°
60°

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652. Catalytic oxidation of NH₃ gives

dinitrogen pentoxide
nitric oxide
nitrogen dioxide
nitrogen

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653. FeSO₄ forms brown ring with

NO₃
NO₂
NO
N₂O₃

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654.

Oxygen molecule exhibits

Paramagnetism
Dimagnetism
Ferromagnetism
Ferrimagnetism

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655.

Oxygen molecule exhibits

Paramagnetism
Dimagnetism
Ferromagnetism
Ferrimagnetism

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656.

When SO₂ is passed through acidified K₂Cr₂O₇ solution

The solution turns blue
The solution is decolourised
SO₂ is reduced
Green Cr₂(SO₄)₃ is formed

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657.

which of the following is oxidised by SO₂?

Mg
K₂Cr₂O₇
KMnO₄
All the above

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Short Answer Type

658. What type of hybridisation is associated with N in NH₃? What is the expected bond angle in NH₃?

NH₃ is Sp₃ hybirdisation as there are three bonding pairs of electrons and one non bonding pair. The bond angle in a molecule of ammonia are 107^o, a value very close to tetrahedral angle (109^o.5^').
The central atom has both shared and unshared electron pairs. The shape of ammonia molecule (NH₃) is trigonal pyramid.

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659.

why is bond dissociation of energy of fluorine molecule less than that of chlorine molecule ?

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660. What are the two important oxidation states of group 16 elements in the periodic table?

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